Sr-rich apatite from the Dangzishan leucitite-ijolite xenoliths (Heilongjiang Province):Mineralogy and mantle-fluid metasomatism  

作　　者：ZHANG WenLan SHAO JiAn WANG RuCheng XU XiSheng CHE XuDong YANG YueHeng 

机构地区：[1]State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China [2]School of Earth and Space Sciences, Peking University, Beijing 100871, China [3]State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

出　　处：《Chinese Science Bulletin》2011年第1期53-63,共11页

基　　金：supported by the National Natural Science Foundation of China (40672039,41372103 and 40221301)

摘　　要：Abundant apatite grains with elevated SrO content were found in leucitite-ijolite xenoliths in the Dangzi Mountain,Heilongjiang Province.Morphological and mineralogical associations,and compositional analysis of the Sr-rich apatite,were carried out using an electron microprobe.Two principal types of apatite were distinguished.One type occurs as short-prismatic crystals with Sr-rich rims,while another type with acicular or finely columnar shapes constitutes Sr-rich apatite element maps and systematic quantitative analysis of apatite revealed great variations in SrO content (0.42%-26.79%).The calculated structural formula of the measured Sr-rich apatite is:(Ca3.15-4.963Sr0.019-1.510Ba0.00-0.030Na0.006-0.108REE0.106-0.153) (P2.84-3.028Si0.009-0.094)O12(F0.675-1.079,Cl0.000-0.256,OH0.084-0.297).Mineralogical textures of apatite implied a replacement mechanism for the Sr-rich apatite.Sr-rich rims of apatite are suggested to have formed after metasomatism (isomorphic replacement) of early fluorapatite in a Sr-,light rare-earth elements (LREE),lithophile light elements (LILE)-and volatile-rich residual melt during late magmatism.However,the acicular apatite probably directly crystallized from a Sr-rich residual melt.The Sr-Nd isotopic composition of the apatite was distinctive from that of leucitite-ijolite and its host rock.These differences,combined with mineralogical features of apatite,imply that Sr-LREE-LILE-volatile-rich components in the residual melt were derived from deep in the asthenosphere,and subsequently were enriched at a late stage in magma evolution.Abundant apatite grains with elevated SrO content were found in leucitite-ijolite xenoliths in the Dangzi Mountain, Heilongjiang Province. Morphological and mineralogical associations, and compositional analysis of the Sr-rich apatite, were carried out using an electron microprobe. Two principal types of apatite were distinguished. One type occurs as short-prismatic crystals with Sr-rich rims, while another type with acicular or finely columnar shapes constitutes Sr-rich apatite element maps and systematic quantitative analysis of apatite revealed great variations in SrO content （0.42%-26.79%）. The calculated structural formula of the measured Sr-rich apatite is： （Ca3.15-4.963Sr0.019-1.510Ba0.00-0.030Na0.00-0.108REE0.106-0.153） （P2.84-3.028Si0.009-0.094）O12（F0.675-1.079, C10.00043.256, OH0.084-0.297）. Mineralogical textures of apatite implied a replacement mechanism for the Sr-rich apatite. Sr-rich rims of apatite are suggested to have formed after metasomatism （isomorphic replacement） of early fluorapatite in a Sr-, light rare-earth elements （LREE）, lithophile light elements （LILE）- and volatile-rich residual melt during late magmatism. However, the acicular apatite probably directly crystallized from a Sr-rich residual melt.The Sr-Nd isotopic composition of the apatite was distinctive from that of leucitite-ijolite and its host rock. These differences, combined with mineralogical features of apatite, imply that Sr-LREE-LILE-volatile-rich components in the residual melt were derived from deep in the asthenosphere, and subsequently were enriched at a late stage in magma evolution.

关 键 词：磷灰石 氧化锶 交代作用 黑龙江省 矿物学 地幔流体 包体 轻稀土元素 

分 类 号：P588.245[天文地球—岩石学] TD971.3[天文地球—地质学]